Pneumatic lifting jack



Dec. 17, 1935. C, JACKSON ET AL 2,024,291

PNEUMATIC LIFTING JACK Filed Feb. 2'0, 1955 3 Sheets-Sheet 1 Attomey Inventing l?, 1935. c. JACKSON ET AL 2,024,291

PNEUMATIC LIFTNG JACK Filed Feb. 2o, 1935 s sheets-sheet 2 Bec. i7, 1935. C, JACKSON ET AL 2,024,291

PNEUMATIC LIFTING JACK Filed Feb. 20, 1935 5 Sheets-Sheet 5 I nventor Attorney l Patented Dec. 17, A1935 UNITED STATES PATENT OFFICE PNEUMATIC LlFTING JACK Application February 20, 1935 Serial No. 7,406

s claims.

'Ihis invention relates to a novel device which may be broadly referred to as a pneumatic lifting jack, and it has particular reference to a structure susceptible of general utility but especially adaptable for use as an automotive accessory.

Needless to say We are aware of the fact that pneumatic hoisting and lifting jacks are not broadly new. It is evident, therefore, that in reducing the present inventive conception to actual practice We have evolved and produced a structure which, it is believed, is unique as an improvement in this line of endeavor in that it has to do with a different type of jack characterized by noteworthy and appreciable structural refinements and special adaptations.

Brieiiy described, we have perfected a unique assemblage of parts characterized in one instance by a hollow base equipped body or standard constructed to provide in one instance a piston accommodating cylinder surrounded by a. jacket deiining an air storage reservoir having valved piping associated therewith in such a way as to store the air to be employed to elevate the piston or to be utilized as a source of supply for other purposes such as for inflating tires, for spray guns,

etc.

Other adjuncts, features and advantages will become more readily apparent from the following description and the accompanying illustrative drawings.

In said drawings, like numerals are employed todesignate like parts throughout the various views, and the views are individually as follows:

Figure l is a vertical sectional view, with portions shown in elevation disclosing the essential details utilized in the construction of the jack.

Figure 2 is a detail fragmentary sectional and elevational view through the base structure, the view being at right angles to that constituting Figure 1.

Figure 3 is an elevational view showing the configuration of the base.

Figure 4 is a detail perspective view of a detachable shaft turning handle.

Figure 5 is a top plan view of Figure 3.

Figure 6 is a perspective detail of a part hereinafter known as the valve operating shaft.

Figure 7 is a view of the valve and piping arrangement.

Referring now to the drawings by distinguishing reference numerals it will be observed that the part of the structure referred to generally as the body is in the nature of a single metal casting and that it comprises a substantially circular concavo-convex base 8 of hollow construction having an inturned' annular flange 9, said base serving as a housing for certain of the mechanism to render it properly protected and accessible. Rising centrally from the base, that is the crown portion thereof, is a perpendicular hollow standard Illof appropriate proportion, the upper portion thereof being substantially solid as indicated at I I and formed with a bore or passage containing a packinggland I 2. This packing gland registers with a centrally disposed tube I3 which 10 serves to define, in one instance, a piston cylinder. In addition it cooperates with the wall of the surrounding standard or jacketv in defining an air storage compartment I4 which may be conveniently designated as a reservoir. At a suit- 15 able point the wall of the reservoir is provided with a screw threaded port to accommodate@ a removable plug or valved fitting I5. This serves to permit air to be put into the reservoir by way of a pressure pump and also permits it to be With- 20 drawn for various uses. The cylinder I3 is open at its bottom and communicates with the hollow base. At this point however, I provide a cover plate or disk I6 held in place by suitable fastenings I'I and this provides the desired cylinder con- 25 struction to accommodate the solid rod piston or plunger I8. The piston is p-rovidedat its bottom with a renewable packing cup I9. Also, the cover plate has connected thereto a small branch pipe 20 which serves to supply air under pressure 30 into the cylinder for raising the piston.A The pipe is connected with the globular casing 2l of the valve unitV 22. The valve element in the casing is denoted by the numeral 23 and is of a threeway type. of the L-shaped pipe .24 and the valve into the cylinder or permits it to be forced back into the reservoir when sufficient downward weight is brought to bear on the piston. The remaining or third pipe is indicated at 25 and this is con- 40 nected to the remaining branch of the valve casing and has its outer end 26 located in the rim of the base for carrying the air out by Way o-f the pipes 24 and 25 to be utilized in any desired manner. 45

In Figure 2 it will be observed that the valve element is provided with a notched turning head 21 to accommodate a tenon on the adjacent c0- operating end of a valve operating shaft or rod 28. This rod has its outer end mounted in a 50 suitable bearing 29 formed on the base and said outer end is formed with a notch 30 which serves as a keyway to accommodate the key 3l on the inner end of the operating handle 32. The handle is of appropriate construction as shown bet- 55 This allows air to be conveyed by way 35 Cil ter in Figure 4. It is detachable so that it may be used at the discretion of the user.

In Figure 2 I call attention to the numeral 33 which designates a pipe connected to the bottom of the reservoir and with a pressure gauge 34 conveniently located on the base to indicate pressure in said reservoir. The numeral 25 merely designates a cover plate for the gauge.

Referring now to the upper end construction of the piston it will be observed that it is construct-ed to provide a hoisting device. That is to say, the piston is formed at its upper end with a screw threaded socket to accommodate a stud 36 on the lower end of a coupling or connecting unit 31. This unit is anged as indicated at 38 to serve to limit the downward movement of the piston by striking against the packing gland i2. The coupling itself is socketed to accommodate a connecting and swivelling screw 39. The head of this is seated in a countersunk recess 40 at the center of a dished head plate 4|. The head plate may, however, be of suitable design depending on the character of work to be lifted. Under ordinary circumstances the jack is employed for automobile work but it could of course, be redesigned slightly and employed for railroad work or for any other desired purpose.

It is not our purpose here to limit the scope of the invention by attempting to define its various commercial uses and advantages. Since the novelty is predicated upon a structure which may be broadly referred to as a pneumatic jack, and since the term jack is used advisedly because of the fact that the invention is usable as an air storage device and reservoir, we will depend largely on the terms of the accompanying claims to deiine the structural novelty. f

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Minor changes'in shape, size and rearrangement of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

Having thus described the invention, what is claimed as new is:

1. A structure of the class described comprising a one-piece casting including a concavo-convex part defining a base and having at its bottom an inturned annular reinforcing and supporting flange, said base having the additional advantage of serving as an enclosure and protective housing for complementa] parts contained therein, a'perpendicular hollow standard rising centrally from said base, having its upper end portion of substantially solid formation and provided with a bore equipped with a packing gland, and a vertical tubular member in alignment with 5 said bore and connected with said solid upper portion at its top and joined at the bottom to the crown portion of said base, said tubular member being open at its bottom, a removable cover` plate for said open bottom, a piston mounted for rel ciprocation in said tubular member permitting the tubular member to serve as a cylinder, said piston having a packing at its inner end, the upper end thereof carrying a swivelly mounted head-plate, said cylinder cooperating with the l surrounding Wall of the standard and defining an air storage compartment, and said Wall being provided with a tire valve or equivalent fitting in the manner and for the purposes described.

2. As a new article of manufacture, a one- 2O piece casting formed at its bottom with a circular concavo-convex base having an inturned annular flange at its bottom, an upstanding hollow standard attached to and rising from said base, the upper portion of said standard being of solid ,at-top formation and provided with a guide bore, a packing gland in said bore, a tubular mem-ber joining said solid portion with that part of the base underlying said bore, said tubular member being open at its bottom and constituting a piston accommodation cylinder, a removable closure plate for the bottom of said cylinder, the wall of said standard being provided at a suitable point with a screw threaded opening and a closing plug for said opening. 3. In a pneumatic jack structure of the class described, a base, a hollow standard mounted on said base and provided with an internal cylinder, said cylinder cooperating with the wall of the standard in dening a storage compartment for air under pressure, a piston slidable in said cylinder, said piston being in the form of a rod and having a flanged coupling member detachably connected with the upper end thereof, said coupling member being provided with a headed screw, a swivelly mounted dished head-plate attached to said coupling member through the instrumentality of said screw, a three-way valve mounted in said base, a connection between said valve and the bottom of said cylinder, a connecli()l tion between the valve and bottom of said air reservoir and a third pipe connection between said valve and the rim portion of the base.

CLIFFORD JACKSON. ROGER L. POWELL. CHARLES BUTTLER. 

